怎么让confirm在完服务器端验证后才弹出来？

Question

怎么让confirm在完服务器端验证后才弹出来？如果验证通不过就不出来。

Answer 1

用ajax或客户回调我这里有一个程序，刚好是实现这个功能的。 首先页面中代码 
<script   type="text/javascript"   language="javascript" > 
                var   xmlHttp   =   null; 
                function   CheckUser() 
                { 
                        try 
                        { 
                                xmlHttp   =   new   ActiveXObject("Msxml2.XMLHTTP"); 
                        } 
                        catch(err1) 
                        { 
                                try 
                                { 
                                        xmlHttp   =   new   ActiveXObject("Microsoft.XMLHTTP"); 
                                } 
                                catch(err2) 
                                { 
                                        xmlHttp   =   new   XMLHttpRequest(); 
                                } 
                        } 
                        var   Text1   =   document.getElementById("Text1"); 
                        var   url   =   "chkuser.aspx?User="   +   Text1.value; 
                        xmlHttp.open("GET",url,true); 
                        xmlHttp.onreadystatechange   =   OnHandler; 
                        xmlHttp.send(null);                 } 
                function   OnHandler() 
                { 
                        if(xmlHttp.readyState   ==   4) 
                        { 
                                var   isValid   =   xmlHttp.responseText; 
                                var   exists   =   document.getElementById("exsits"); 
                                exists.innerHTML   =   isValid.substring(0,4); 
                        } 
                } 
</script > 
<input   id="Text1"   type="text"   onblur="CheckUser()"   / > <label   d="exsits" > </label > <br   / > 然后建一个chkuser.aspx，其后台代码改为 
protected   void   Page_Load(object   sender,   EventArgs   e) 
        { 
                string   user   =   this.Request.QueryString["User"];                 if   (UserExist(user)) 
                { 
                        Response.Write("存在"); 
                } 
                else 
                { 
                        Response.Write("不存在"); 
                }         }         private   bool   UserExist(string   username) 
        { 
                ClassLib.Employee   emp   =   new   ClassLib.Employee(); 
                return   emp.EmpNameExist(username); 
        } 

Answer 2

EricGuzuqiang 
--------
你怎么在服务器端得到confirm的返回值呢？
你这里讲的好象不太符合我的要求啊，
能不能再讲具体点啊？要有confirm的啊！

Answer 3

最好还是在客户端完成验证，一定需要服务器端验证，就用ajax完成前面的服务端验证，然后再执行你的步骤，
给服务器端的按扭加上客户端事件，在js里完成验证。
用event.returnValue=false;可以终止事件，不执行到服务器端

Answer 4

yzqlee 
---------------
用ajax怎么做服务器端的验证啊？
能不能说具体点啊？谢谢了？

Answer 5

function   OnHandler()  
                {  
                        if(xmlHttp.readyState   ==   4)  
                        {  
                                var   isValid   =   xmlHttp.responseText;  
                                var   exists   =   document.getElementById("exsits");  
                                var res =   isValid.substring(0,1);
                                if(res == "不")
                                     confirm("");
                        }  
                }  

Answer 6

客户端回调 我这里也有一段程序 供参考<%@ page language="C#" % > 
<%@ implements interface="System.Web.UI.ICallbackEventHandler" % > <script runat="server" >     private string _returnFromServer;     public void RaiseCallbackEvent(string eventArgs) 
    { 
        try 
        { 
            int value = Int16.Parse(eventArgs);             if( value  >= 1 && value  <= 1000 ) 
                this. _returnFromServer = "You entered the number: " +  
eventArgs; 
            else 
                this. _returnFromServer = "Please enter a number between 1 and  
1000"; 
        } 
        catch 
        { 
            throw new ApplicationException("You must enter a number."); 
        } 
    } 
      public string GetCallbackResult() 
    { 
        return this._returnFromServer; 
    }     
    public void Page_Load(object sender, EventArgs e) 
    { 
         
        if (!Request.Browser.SupportsCallback) 
  throw new ApplicationException("This browser doesn’t support Client  
callbacks.");         string src = Page.ClientScript.GetCallbackEventReference( 
                                   this,  
                                   "arg", 
                                   "ClientCallback", 
                                   "ctx", 
                                   "ClientErrorCallback", 
                                   false);         string mainSrc = @"function ValidateNumber(arg, ctx) 
                           { " + src + "; }";         Page.ClientScript.RegisterClientScriptBlock( 
                                   this.GetType(), 
                                   "ValidateNumber", 
                                   mainSrc, 
                                   true); 
    } </script > <html > 
<head runat="server" > 
     <title >Client Callback </title > 
     
     <script language="javascript" > 
     
        function Validate() 
        { 
            var n = document.forms[0].txtNumber.value;             //Call the server-side method to validate the number 
            ValidateNumber(n, "txtNumber"); 
        } 
         
        //ClientCallback will be executed after the server-side method 
        //is executed and the server response is parsed. 
function ClientCallback( result, context ) 
        { 
            alert(result); 
        } 
         
        //If the server-side method throws an exception, the  
ClientErrorCallback 
        //will be executed to show the exception. 
        function ClientErrorCallback( error, context ) 
        { 
            alert("The validation failed. " + error); 
        } 
     
     </script > </head > 
<body > 
     <form runat="server" > 
      Please enter a number between 1 and 1000: <br / > 
       <input id="txtNumber" name="txtNumber" type="text"/ > 
       <button id="butValidate" OnClick="Validate()" >Validate </button > 
     </form > 
</body > 
</html > 

Answer 7

function ClientCallback( result, context )  
        {  
            if(res== ...)
                  confirm(); 
        }  

Answer 8

谢谢EricGuzuqiang ，谢谢大家，如果有好的办法都show上来，我想我说的这种情况在项目中还是很多的。

Answer 9

你先看看Ajax的例子，那里可以找到你的答案的